Wake Up!

Someone in the church at Corinth taught that there is no resurrection. However, in 1 Corinthians 15:33, I believe Paul revealed the motives of such teaching, that such doctrine opened the door to immorality. Therefore, Paul taught further, “Awake to righteousness, and do not sin; for some do not have the knowledge of God. I speak this to your shame” (1 Corinthians 15:34).
Paul spoke to them as though they should have seen the consequences of denying things that he had taught them and that they had initially accepted.
Have you denied a biblical teaching that you once accepted? If so, why?